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SP (Single Axle Pusher Unique Issues) If you have a unique issue with your SP model coach and it can't be answered in one of the other forums here, then this is where you can list it....List your SP parts here too.

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  #1  
Old 01-10-2019
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Default R&R '91 SP Alternator?

I have an appointment tomorrow (Friday) morning at Industrial Truck and Power in FT Worth to diagnose and repair engine charging problem. Long and short of it is that the charge output has been weak and has finally gone to zero.

I asked for a ballpark cost estimate and here's what they said:

diagnose: $400
If alternator R&R: 1.5 hrs x $150/hr
If new alternator: cost maybe around $300

Is that what others have paid for SP36 alternator repalcement? $1000 seems fair but I'm recalling stories about shops having trouble getting to the alt with the 45-degree limited radiator swing. I don't think this shop is yet aware of working in an SP engine room. Is 1.5 hrs close?

Is access from inside coach/on top of engine necessary? I need to move a bunch of stuff from under the bed if the techs need access for R&R. I've tried reaching the alternator from under the bed when adjusting alternator belt tension, but I didn't have the required length of ratchet extensions to reach and there wasn't much of a path to the bolt anyway. Did they need it when your alternator was replaced?


Thanks WOG!
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Old 01-10-2019
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I had mine rebuilt at Romaine Electric - they have multiple locations throughout the Seattle area. The cost was $245. My coach is the woody/randy engine swap and the cost of a new alternator would make a grown man cry.
All work was done through the side doors. Mechanics didn't have to work from the hatch area. Make sure they are "sized appropriate"; thin is good.

On a side note, 1.5 hours appears low, I would double the time.
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Old 01-10-2019
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$400 to check voltage output on an alternator?
No way in my world.
I have changed a few alternators on SP's and i never went into the coach,i did it all from the back and i'm not petite.
Heck,i'm not even large,i'm XX large!
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Old 01-10-2019
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Quote:
Originally Posted by craig k View Post
I had mine rebuilt at Romaine Electric - they have multiple locations throughout the Seattle area. The cost was $245. My coach is the woody/randy engine swap and the cost of a new alternator would make a grown man cry.
All work was done through the side doors. Mechanics didn't have to work from the hatch area. Make sure they are "sized appropriate"; thin is good.

On a side note, 1.5 hours appears low, I would double the time.
You can buy new alternators at your rebuilt price.
Buy new and forget it.
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Old 01-11-2019
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Change fro the rear. No need to go inside the coach. 1.5 is low. I would plan 1.5 to learn and 2 to do.
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Old 01-11-2019
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Hmmm, I could use that diagnostic fee for something I need. I haven't measured the alternator output myself, but I'm Q-bound and could probably get some help with all that from the BOF gang. Or the Hot Birds. Joe G with his fabulous waveform display multi-meter is skipping this year. But Gardiner is going, he's multimeter wiz. Assuming the culprit is this 100K-mile alternator, do you reckon the weight of the alternator is the biggest impediment to R & R?

The agent I discussed it with explained the high diagnostic: "How do you know its the alternator? Could be a lot of things (relays, wiring, ...) causing your charging problems." To which I had no answer except that I'm going down the road, charging house and chassis batteries from generator/120V plugin charger, so everything but the engine charging (and big cables running forward to inverter bay) seems fine.

What do you say, is this one for the Q?
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Last edited by nbedinger; 01-11-2019 at 01:33 AM.
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Old 01-11-2019
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The side-door stories still amaze me. But my '91 got Primus heat in the curb-side door, two boilers. I wiz considering removing them to make the job easier. I did rig up a ratchet handle several feet long to reach in the side and turn the pivot bolt on the BACK OF THE ALTERNATOR. What an oddball design
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Old 01-11-2019
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Ned,
I would suggest to run to Q with the Generator on to keep Batts up and there will be plenty of help to get the alternator changed out, just pick one up on the way there... Also, Joe G, will not be at Q this year...
HTH
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Old 01-11-2019
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Hi Larry--

Yore reading my mind. Thanks for the reality check ;-)

I think Rick posted a Leece-Neville p/n for his SP a couple of years back, Yuma NAPA could get it for me if I call ahead. Not sure that's the same alt for my CAT arrangement. Maybe the CAT shop in Blythe could help cross the CAT alt to an aftermarket model?
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I put a Bosch alternator on the blue SP listed on BBBB.
Any one wire J mount ateranator will bolt on.
If you have a volt meter you can check the output.
With engine off,check battery voltage at the battery.
With engine running check the voltage at the battery.
If the voltage did not change you have a charging issue.


Lets say the engine off voltage was 12.5 volts,and the engine running voltage was
13.8 volts,your charging.


Another redneck way to check to see if the alternator is charging is with the engine running,see if a screwdriver or wrench will stick (magnetically) to the back of the alternator.
The alternator creates a magnetic field when charging.
Be carefull not to stick your fingers in the fan or stick the wrench onto a power cable!!.
Rick did help me change the one on the blue SP,i reached in from the side louvered door and held a wrench on the nuts while he unscrewed the bolts.
One other thing,for some reason BB used 2 bolts and nuts on the mount,i replece the 2 bolts with one long bolt and it makes the job so much easier.
No need to remove the primus to do the job.
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